Yellowstone English and Environmental Studies Program International(YESPI) is a private school based in the Greater Yellowstone Ecosystem. It offers specialized curriculums for international students to get into and then succeed at American high schools and universities. YESPI also features intensive environmental study workshops for government technocrats and business leaders who are developing solutions for environmental challenges in their home countries.

For all the classes, the Greater Yellowstone Ecosystem—a 20 million acre region that contains Yellowstone National Park, Grand Teton National Park, abundant wildlife, and countless ecological wonders—is the outdoor laboratory and classroom.